Revert "Broaden AggregateUDF typing for PyCapsule support"

This reverts commit fad17cc.

Author: kosiew

python/datafusion/user_defined.py

@@ -293,11 +293,11 @@ class AggregateUDF:
     def __init__(
         self,
         name: str,
-        accumulator: Callable[[], Accumulator] | AggregateUDFExportable,
-        input_types: list[pa.DataType] | None,
-        return_type: pa.DataType | None,
-        state_type: list[pa.DataType] | None,
-        volatility: Volatility | str | None,
+        accumulator: Callable[[], Accumulator],
+        input_types: list[pa.DataType],
+        return_type: pa.DataType,
+        state_type: list[pa.DataType],
+        volatility: Volatility | str,
     ) -> None:
         """Instantiate a user-defined aggregate function (UDAF).
 
@@ -307,18 +307,6 @@ def __init__(
         if hasattr(accumulator, "__datafusion_aggregate_udf__"):
             self._udaf = df_internal.AggregateUDF.from_pycapsule(accumulator)
             return
-        if (
-            input_types is None
-            or return_type is None
-            or state_type is None
-            or volatility is None
-        ):
-            msg = (
-                "`input_types`, `return_type`, `state_type`, and `volatility` "
-                "must be provided when `accumulator` is callable."
-            )
-            raise TypeError(msg)
-
         self._udaf = df_internal.AggregateUDF(
             name,
             accumulator,
@@ -362,10 +350,6 @@ def udaf(
         name: Optional[str] = None,
     ) -> AggregateUDF: ...
 
-    @overload
-    @staticmethod
-    def udaf(accum: AggregateUDFExportable) -> AggregateUDF: ...
-
     @staticmethod
     def udaf(*args: Any, **kwargs: Any):  # noqa: D417, C901
         """Create a new User-Defined Aggregate Function (UDAF).